Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1365-2486.2011.02534.x |
Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain | |
Rey, Ana1; Belelli-Marchesini, Luca2; Were, Ana1; Serrano-Ortiz, Penelope1; Etiope, Giuseppe3,4; Papale, Dario2; Domingo, Francisco1; Pegoraro, Emiliano1 | |
通讯作者 | Rey, Ana |
来源期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2012 |
卷号 | 18期号:2页码:539-554 |
英文摘要 | Despite the advance in our understanding of the carbon exchange between terrestrial ecosystems and the atmosphere, semiarid ecosystems have been poorly investigated and little is known about their role in the global carbon balance. We used eddy covariance measurements to determine the exchange of CO2 between a semiarid steppe and the atmosphere over 3 years. The vegetation is a perennial grassland of Stipa tenacissima L. located in the SE of Spain. We examined diurnal, seasonal and interannual variations in the net ecosystem carbon balance (NECB) in relation to biophysical variables. Cumulative NECB was a net source of 65.7, 143.6 and 92.1 g C m-2 yr-1 for the 3 years studied, respectively. We separated the year into two distinctive periods: dry period and growing season. The ecosystem was a net source of CO2 to the atmosphere, particularly during the dry period when large CO2 positive fluxes of up to 15 mu mol m-2 s-1 were observed in concomitance with large wind speeds. Over the growing season, the ecosystem was a slight sink or neutral with maximum rates of -2.3 mu mol m-2 s-1. Rainfall events caused large fluxes of CO2 to the atmosphere and determined the length of the growing season. In this season, photosynthetic photon flux density controlled day-time NECB just below 1000 mu mol m-2 s-1. The analyses of the diurnal and seasonal data and preliminary geological and gas-geochemical evaluations, including C isotopic analyses, suggest that the CO2 released was not only biogenic but most likely included a component of geothermal origin, presumably related to deep fluids occurring in the area. These results highlight the importance of considering geological carbon sources, as well as the need to carefully interpret the results of eddy covariance partitioning techniques when applied in geologically active areas potentially affected by CO2-rich geofluid circulation. |
英文关键词 | alpha grass carbon sequestration ecosystem respiration eddy covariance geogas geothermal activity grasslands net ecosystem carbon balance |
类型 | Article |
语种 | 英语 |
国家 | Spain ; Italy ; Romania |
收录类别 | SCI-E |
WOS记录号 | WOS:000299042500013 |
WOS关键词 | EDDY COVARIANCE TECHNIQUE ; DIOXIDE EXCHANGE ; FLUX MEASUREMENTS ; MOJAVE-DESERT ; CO2 EXCHANGE ; WATER-VAPOR ; SOIL ; TERRESTRIAL ; FOREST ; RATES |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/172648 |
作者单位 | 1.High Spanish Sci Council CSIC, Dept Desertificat & Geoecol, Expt Stn Arid Zones EEZA, Almeria, Spain; 2.Univ Tuscia, Dept Innovat Biol Agrofood & Forest Syst DIBAF, Viterbo, Italy; 3.Ist Nazl Geofis & Vulcanol, Sez Roma 2, Rome, Italy; 4.Univ Babes Bolyai, Fac Environm Sci & Engn, R-3400 Cluj Napoca, Romania |
推荐引用方式 GB/T 7714 | Rey, Ana,Belelli-Marchesini, Luca,Were, Ana,et al. Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain[J],2012,18(2):539-554. |
APA | Rey, Ana.,Belelli-Marchesini, Luca.,Were, Ana.,Serrano-Ortiz, Penelope.,Etiope, Giuseppe.,...&Pegoraro, Emiliano.(2012).Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain.GLOBAL CHANGE BIOLOGY,18(2),539-554. |
MLA | Rey, Ana,et al."Wind as a main driver of the net ecosystem carbon balance of a semiarid Mediterranean steppe in the South East of Spain".GLOBAL CHANGE BIOLOGY 18.2(2012):539-554. |
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